irq_find_mapping(9)

💅 irq_find_mapping

okay bestie, welcome to the Kernel API Manual entry for irq_find_mapping — literally the "where's my linux irq" of the irq subsystem 🎀

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🌸 NAME

irq_find_mapping — find a linux irq from a hw irq number 💖

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✨ SYNOPSIS

unsigned int irq_find_mapping (struct irq_domain *domain ,
irq_hw_number_t hwirq );

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🦋 ARGUMENTS

• domain — the domain that owns this hardware interrupt 👑 like, this is its turf, no cap
• hwirq — the hardware irq number inside that domain's space 🔢

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⭐ RETURN

gives you back the linux irq number, or 0 if it wasn't found 😭 that's the whole vibe check, fr fr

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🌈 SEE ALSO

peep the kernel file ./include/linux/irqdomain.h and all these iconic friends 🫶

• struct irq_fwspec(9)
• struct irq_fwspec_info(9)
• struct irq_domain_ops(9)
• struct irq_domain(9)
• struct irq_domain_info(9)
• irq_domain_create_linear(9)
• irq_create_mapping(9)
• irq_resolve_mapping(9)
• irq_domain_create_hierarchy(9)
• irq_domain_alloc_irqs(9)

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lowkey a mood that 0 means "not found" — don't forget it, bestie 💀

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mwah 💋 this page came from ./include/linux, version vibes of October 2026, and it's literally irq_find_mapping(9) — slay, go map some interrupts 🧚‍♀️✨